Sunflower Pot Size?

I am going to germ some tomato and sunflower seeds today. I have the whole tomato thing on lockdown but I have never grown sunflowers before. I got some really kick ass seeds for a type that are red/blue/purple instead of yellow.

What size pot would one need for a full-sized sunflower plant ? Common sense tells me about a 2-3 gallon?


Thanks.

They get pretty big. I've seen lots of six or seven foot tall ones .I reckon a five gallon pot might not be too big.

What is the name of the sunflower seeds you have, that sounds really interesting! As for pot size of course bigger is better at least 7 gallons, I've seen sunflowers that are 8+ feet tall.

I figured if I put them into a smaller container they might stop at 5 feet or something. I will get a couple of bigger pots ready. I bought some kellog's soil to grow this stuff in but I opened the bag and I think the soil is moldy.

The seeds are called "red sun" sunflowers. Not the best pic, but it may help. They just looked so different I wanted to try them!
I bought the seeds at Lowe's.

cool, thanks.